单词学习：infiltration 名词
infiltration
/ˌɪnfɪlˈtreɪʃn/
渗透；渗入；潜入
The enemy's infiltration of the camp was discovered by Mr. Gu, the vigilant teacher.
敌人对营地的渗透被警惕的顾老师发现了。
单词卡片
卡片已就绪
